FILE - This frame grab from video shows lightning inside a massive tornado on Sunday, May 22, 2011, outside Joplin, Mo.  (AP Photo/tornadovideo.net)

10 deadliest US tornadoes

1902 May 18 114 deaths in Goliad, Texas. 1908 April 24 143 deaths in Amite, La., and Purvis, Miss. 1913 March 23 103 deaths in Omaha, Neb. 1…

Punxsutawney Phil, the weather prognosticating groundhog, takes a bite out of the gloved hand of handler Ron Ploucha during the 129th celebration of Groundhog Day on Gobbler's Knob in Punxsutawney, Pa. Monday, Feb. 2, 2015. Phil saw his shadow, predicting six more weeks of winter weather. (AP Photo/Gene J. Puskar)

Photos: Groundhog Day

Phil saw his shadow, predicting six more weeks of winter weather.